Difference 91 and 90 13b
#4
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Originally Posted by rotaryspitfire
I;m not sure but I heard there is a difference between the 91 and 90 13b motor. Any answers? Something about the rotors?
I am pretty sure that they are the same, unless your comparing an 88 to 89
Series 4 86-88 have lower compression rotors
Series 5 89-91 have slightly different intake manifolds and have higher compression rotors.
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